The Voice ratings have been steadily climbing for this season, averaging 12m viewers per episode.

In a statement, NBC chairman Robert Greenblatt said: "This pick-up will assure the many dedicated Voice fans that this innovative show will continue to bring some of the most talented new voices to the world's attention through all of next year.

"With the addition of Usher and Shakira as rotating coaches to join Christina, Cee-Lo, Adam and Blake in the next cycle, we know that this incredibly addictive programme will remain even more relevant as we move forward through this exciting season."